English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

The small-scale power spectrum of the cosmological matter distributiontogether with other cosmological data provides a sensitive measure of the hotdark matter fraction, leading to restrictive neutrino mass limits. We extendthis argument to generic cases of low-mass thermal relics. We vary the cosmicepoch of thermal decoupling, the radiation content of the universe, and the newparticle's spin degrees of freedom. Our treatment covers various scenarios ofactive plus sterile neutrinos or axion-like particles. For three degeneratemassive neutrinos, we reproduce the well-known limit of m_nu < 0.34 eV. In a3+1 scenario of 3 massless and 1 fully thermalized sterile neutrino we findm_nu < 1.0 eV. Thermally produced QCD axions must obey m_a < 3.0 eV,superseding limits from a direct telescope search, but leaving room for solareV-mass axions to be discovered by the CAST experiment.Comment: 15 pages, 6 figures, matches version in JCA

Cosmological mass limits on neutrinos, axions, and other light particles